Air pollution is not the same everywhere. Different pollutants are released into
the atmosphere from a wide range of sources. Once in the atmosphere, they
can transform into new pollutants and spread around the world. Designing and
implementing policies to address this complexity are not easy tasks. Below is an
overview of air legislation in the European Union.

Data are for ozone precursors. The distance to target results are shown in green (countries need to do more to be on track to meet their ceiling in 2010) and purple (countries are on track to meet their ceiling in 2010)